Even if you do not get upgraded, Carnival's inside cabins suit us just fine. We often book inside guarantee when needing to minimize cost and we're quite happy with that. We only had one trip where we got a bad cabin..over the crew bar, so loud music turning off and on all night. Complained at purser's desk and got moved. But, after dozens of cruises, that was the only time. You'll have fun regardless.
Marty